/* 单词索引（用指针数组实现）*/
#include<stdio.h>
int main(void)
{
   int i, flag = 0;
   char ch;
   const char 
*gan[]
 = {"red", "blue", "yellow", "green", "black" };    

   ch = getchar();
   for(i = 0; i < 5; i++) {
        if(
gan[i][0]==ch
){
           flag = 1;
           puts(
gan[i]
);
        }
   }
   if(flag == 0) {
     printf("Not Found\n"); 
   }

   return 0;
}